diff --git a/docs/source/jupyter/multiple_wrappers.ipynb b/docs/source/jupyter/multiple_wrappers.ipynb
index f30eddd..c587e4b 100644
--- a/docs/source/jupyter/multiple_wrappers.ipynb
+++ b/docs/source/jupyter/multiple_wrappers.ipynb
@@ -158,7 +158,7 @@
     "db_name = input(\"Database name: \")\n",
     "host = input(\"Host: \")\n",
     "port = int(input(\"Port [5432]: \") or 5432)\n",
-    "postgres_url = URL.create(\"postgresql\", user, pwd, host=host, database=db_name)"
+    "postgres_url = str(URL.create(\"postgresql\", user, pwd, host=host, database=db_name))"
    ]
   },
   {
@@ -264,7 +264,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "with SqlAlchemySession(str(postgres_url)) as session:\n",
+    "with SqlAlchemySession(postgres_url) as session:\n",
     "    wrapper = city.CityWrapper(session=session)\n",
     "    wrapper.add(emmo_town)\n",
     "    session.commit()"